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Old 06-09-2013, 02:42 PM   #1
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Question 3.8 bored to a 4.2?

So I went around on youtube just looking to see if there were any upgrades that I wanted to add to my list for my stang and came across a guy that had bought this bored out package for his 3.8 v6. Heres the link to the kit:

http://www.supersixmotorsports.com/_...1PowerPaks.pdf


its almost 3 thousand dollars. Wondering if it would be worth it down the road to do this since I do want a new cam but boring it out would be a pretty sweet and it SAYS to give you 80 hp. Is there a cheaper way of doing this and will it really change it to a 4.2?
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Old 06-09-2013, 04:20 PM   #2
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Well the 4.2 would have a different crank(longer stroke), not sure if the bore changes. If you don't wanna mess with turbos or a super charger the this would be a good upgrade. The comment on super six about those performance packs being a more reliable option is true, but you can also build turbo/super kits to be reliable as well. This is a "safe" upgrade to get 80 extra HP out without boost controllers and turbo manifolds and the like. Also you can still add a supercharger or a turbo to that kit, it you want more.

---------- Post added at 03:20 PM ---------- Previous post was at 03:18 PM ----------

I think the power pak and the 4.2 kit are two different kits. The power pak alone can add up to 80hp but if you threw a 4.2 stroked kit in as well, you would be turning up some pretty good numbers for a N/A V6.
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Old 06-09-2013, 05:03 PM   #3
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Originally Posted by Kingmidas87 View Post
Well the 4.2 would have a different crank(longer stroke), not sure if the bore changes. If you don't wanna mess with turbos or a super charger the this would be a good upgrade. The comment on super six about those performance packs being a more reliable option is true, but you can also build turbo/super kits to be reliable as well. This is a "safe" upgrade to get 80 extra HP out without boost controllers and turbo manifolds and the like. Also you can still add a supercharger or a turbo to that kit, it you want more.

---------- Post added at 03:20 PM ---------- Previous post was at 03:18 PM ----------

I think the power pak and the 4.2 kit are two different kits. The power pak alone can add up to 80hp but if you threw a 4.2 stroked kit in as well, you would be turning up some pretty good numbers for a N/A V6.
Thanks for the reply! So im still confused...would it make my 3.8 a 4.2? I mean personally im scared of turbos and superchargers cause I want to keep my stang for a long time and dont wanna lose it to soemthing going wrong with a turbo/supercharger.

Whats a stroke kit? Sorry new to messing with engines!
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Old 06-09-2013, 05:16 PM   #4
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Cubic displacement is the bore times the stroke.
The 3.8 has .10 pistons and the 4.2 bored.30 over.
The difference is the stroke, which is basically a different cam. It causes the piston to have a lower bottom dead center to possibly a higher top dead center.
T.D.C. to B.D.C. is your stroke.
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Old 06-09-2013, 08:14 PM   #5
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The "power pak" that SSM offers is a ported upper/lower intake, ported heads with larger valves and a hotter cam to utilize the porting and larger valves. That kit alone won't make it a 4.2, it will still be a 3.8, but it will get more power outta your 3.8 with out having to pull the whole motor out and do the bottom end( the pistons, rods, crank; which is what you change to make it a 4.2). The benefits to the power pak is you can install everything while the motor is still in the car, you're guaranteed power gains and if you still want a 4.2, you can build it with this power pak on and get even more gains.
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Old 06-09-2013, 08:24 PM   #6
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You really could either one before the other. Both are kinda labor intensive but do-able. If you had the money and didn't have an engine hoist or an engine stand I'd say that power pak would be a good upgrade. Ive looked into the power pak myself and think it would be a great way to freshen up the top end, add some ponies and have the porting and larger valves give you the option of getting better gains outta a turbo or supercharger if you decide to take that route later down the road.
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Old 06-09-2013, 09:17 PM   #7
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Originally Posted by Kingmidas87 View Post
You really could either one before the other. Both are kinda labor intensive but do-able. If you had the money and didn't have an engine hoist or an engine stand I'd say that power pak would be a good upgrade. Ive looked into the power pak myself and think it would be a great way to freshen up the top end, add some ponies and have the porting and larger valves give you the option of getting better gains outta a turbo or supercharger if you decide to take that route later down the road.
Yeah see i figured for now I could spend this money and get a huge upgrade to my engine and get alot of ponies and then itll handle a turbo or super charger later on more efficiently.
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Old 06-10-2013, 01:49 AM   #8
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A 4.2 is an F150 bottom end, they have the same bore 3.81" just the 4.2 has a longer (3.74") stroke

The ssm stroker kits aren't really a 4.2 per say, due to them having a larger bore closer to a 4.3

Cheap option is junkyard f150 bottom end and yes it holds up just fine, I run mine out to 6000 rpms every time I drive the car lol tough little motors
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Old 06-10-2013, 07:48 AM   #9
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Originally Posted by davidcseifert View Post
A 4.2 is an F150 bottom end, they have the same bore 3.81" just the 4.2 has a longer (3.74") stroke

The ssm stroker kits aren't really a 4.2 per say, due to them having a larger bore closer to a 4.3

Cheap option is junkyard f150 bottom end and yes it holds up just fine, I run mine out to 6000 rpms every time I drive the car lol tough little motors
Yeah I've heard of the f150 build. Hot a mechanic that's a family friend and he said to call him for anything so ill probably ask him to call around an get me a price on a f150 bottom end and see what he thinks. Cheapest route would be nice lol
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Old 06-10-2013, 11:05 AM   #10
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Quote:
Originally Posted by samuelsmith
Cubic displacement is the bore times the stroke.
The 3.8 has .10 pistons and the 4.2 bored.30 over.
The difference is the stroke, which is basically a different cam. It causes the piston to have a lower bottom dead center to possibly a higher top dead center.
T.D.C. to B.D.C. is your stroke.
Haha your cam doesn't have anything to do with the bore an stroke haha your thinking of the crankshaft lol
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Old 06-10-2013, 02:29 PM   #11
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Originally Posted by Sluder4 View Post
Yeah see i figured for now I could spend this money and get a huge upgrade to my engine and get alot of ponies and then itll handle a turbo or super charger later on more efficiently.
Yeah, that power pak would be a good step in the right direction. Plus your bottom end would still be stock and reliable. Assuming its got normal wear on it.
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Old 06-10-2013, 02:33 PM   #12
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Yeah, that power pak would be a good step in the right direction. Plus your bottom end would still be stock and reliable. Assuming its got normal wear on it.
Yeah it's just a DD for right now and only 76k miles on it
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Old 06-10-2013, 03:48 PM   #13
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Haha your cam doesn't have anything to do with the bore an stroke haha your thinking of the crankshaft lol
lol I was wondering when someone was going to catch that, eagle eyes.

Stroke it to the east, stroke it to the west, stroke it to the engine I love best. I be stroke n
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